Vandeweghe then went on to also beat Garbiñe Muguruza (Spain) in the quarterfinals, securing herself a spot in the semifinals.

Despite these fourth-round upsets, the names most of the players in the semifinals will be familiar to even casual tennis fans: Stan Wawrinka (who won the U.S. Open in September), will play Roger Federer in one of the men’s semifinals, Vandeweghe will contend with 13th seed, Venus Williams in one of the women’s semifinals, and Rafael Nadal and Serena Williams will both be competing in semifinal round matchups.

Even Serena is excited about going head to head with a woman who many consider to be her predecessor. “I’m so proud of Mirjana. It’s so good to see her back out and to see her in the semifinals really just is so inspiring for me,” Williams said after her victory over quarterfinal challenger Johanna Konta.

“No matter what happens, someone 34 or older will be in the final and that’s just really awesome.” With Serena and Venus still dominating the competition at 35 and 36 years old, respectively, it will be the first time in the Open era that two players 35 or older have reached the final four of a Grand Slam competition, according to the Associated Press. Seems like youngster Vandeweghe’s age might be a disadvantage against this old guard.

The men’s singles competition will also be dominated by older players, although nothing as record-breaking or unusual as the women’s singles bracket. Federer, 35, will play Wawrinka, 31, and Nadal, 30, will play Dimitrov, 25.